JP3655201B2 - Hybrid magnet type DC machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hybrid magnet type DC machine in which a stator in a DC machine is provided with a coil and a permanent magnet.
[0002]
[Prior art]
2. Description of the Related Art Low power consumption and high torque small motors that have been developed in the past have been widely used in the fields of automobiles, OA equipment, vending machines, medical / welfare equipment, and the like. Normally, most of the motors used in this type of field are motors using permanent magnets, and the technology is quite mature. For this reason, it is difficult to dramatically increase the efficiency and reduce the torque. A motor using a hybrid magnet is known in order to reduce the size and increase the torque.
[0003]
The present applicant has proposed a hybrid magnet type DC motor pursuing such high efficiency and small size and high torque, and an example thereof is shown in FIG. More specifically, the armature 51 of the DC motor 50 includes a rotating iron core 53 that is fixed to the motor rotating shaft 52 in an externally fitted state, and a rotating coil 54 that is wound around the rotating iron core 53. A plurality of teeth 53a are radially formed on the rotating iron core 53 from the center thereof.
[0004]
A substantially annular stator 56 is fixed to the inner peripheral surface side of the yoke 55 of the DC motor 50. The stator 56 is configured as a hybrid magnet having two electromagnets 57, 58 and a pair of permanent magnets 59, 60, and is arranged in a state of facing the outer peripheral surface of the armature 51 with a predetermined gap. That is, the stator 56 is assembled in a state where the two electromagnets 57 and 58 are opposed to each other with the armature 51 interposed therebetween, as shown in FIG.
[0005]
The electromagnets 57 and 58 have fixed iron cores 61 and 62 and fixed coils 63 and 64 wound around the iron core portions. The fixed iron cores 61 and 62 include pole cores 65 and 66 made of a plate material having a substantially semicircular cross section. The pole cores 65 and 66 are arranged to face the teeth 53a of the armature 51 with a predetermined gap.
[0006]
The pole cores 65 and 66 have plate-like extending portions 65a and 66a that extend long on both sides in the circumferential direction. The extending portions 65a and 66a are bent at both ends in the circumferential direction and extend outward in the radial direction. At both end portions of the two pole cores 65 and 66, the extending portions 65a and 66a extending in the radial direction are opposed to each other with a predetermined distance.
[0007]
The two permanent magnets 59 and 60 are respectively sandwiched between a pair of extending portions 65a and 66a facing each other at both ends of the two pole cores 65 and 66. That is, the N poles of the permanent magnets 59 and 60 are in contact with the extending portion 65 a of the N pole core 65, and the S poles of the permanent magnets 59 and 60 are in contact with the extending portion 66 a of the S pole core 66. . The permanent magnets 59 and 60 are arranged in a direction in which the direction connecting the N pole and the S pole substantially coincides with the motor circumferential direction.
[0008]
[Problems to be solved by the invention]
By the way, in the DC motor having this structure, in order to increase the magnetic force of the permanent magnet in order to further increase the torque, it is necessary to increase the area of the side surface of the permanent magnet that faces the pole core. That is, in FIG. 4, it is necessary to increase the area of the side surfaces 59a and 60a of the permanent magnets 59 and 60 by increasing the dimension in the motor radial direction of the side surfaces 59a and 60a of the permanent magnets 59 and 60. For this reason, the hybrid magnet portion becomes thick in the motor radial direction, and the yoke portion diameter becomes large. This is a problem in reducing the size of the DC motor, and also increases the manufacturing cost of the DC motor.
[0009]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a hybrid magnet type DC machine that can increase the effect of hybridization without increasing the size and cost. There is.
[0010]
[Means for Solving the Problems]
In order to solve the above problem, an invention according to claim 1 is an armature that generates a magnetic field that always generates a rotational force by a rectifier, in which a rotating coil is wound around a rotating iron core having pole teeth on a peripheral surface; A plurality of electromagnets, wherein a stationary coil is wound around a stationary core having a pole core close to and facing the rotating iron core so that an inner space faces the armature, and a magnetic field having different polarities in the circumferential direction is generated alternately, and a plurality of electromagnets And a hybrid magnet composed of a plurality of permanent magnets each having a N pole abutting on an N pole fixed core and a S pole contacting an S pole fixed iron core, and being arranged magnetically separated from the permanent magnet. A magnetically permeable fixed yoke that contacts at the protrusion of the fixed iron core, the pole core is formed in a substantially semicircular cross section, and the permanent magnet is formed on the outer peripheral surface side of the extending portion protruding from both ends of the electromagnet. Abutting the inner surface And summarized in that it was.
[0011]
According to a second aspect of the present invention, in the hybrid magnet type DC machine according to the first aspect, the permanent magnet includes both magnetic parts, and the magnetic parts are arranged so that the magnetic directions are opposite to each other. The gist is that they are magnetically separated by a magnetic insulator.
[0012]
According to a third aspect of the present invention, in the hybrid magnet type DC machine of the second aspect, in the both magnetic parts of the permanent magnet, the direction connecting the N pole and the S pole is along the radial direction of the armature. The gist of this arrangement is as follows.
[0013]
According to a fourth aspect of the present invention, in the hybrid magnet type DC machine according to the second or third aspect of the present invention, the magnetic transmission plate material straddling the two magnetic parts is in contact with the two magnetic parts of the permanent magnet on the outer peripheral surface side. The gist is that the magnetically permeable plate member and the pole core are disposed so as to be sandwiched.
[0014]
(Function)
According to the first and second aspects of the present invention, the permanent magnet is disposed in contact with the fixed iron core so that the magnetism of the permanent magnet is the same as the magnetism of the electromagnet. It is possible to obtain a strong magnetic flux called the magnetic flux. Further, since the inner space of the fixed coil faces the armature, it is not necessary to take a shape such as bending the fixed iron core so that the magnetic direction of the electromagnet faces the armature side. For this reason, the magnetic flux which comes out of a fixed iron core is used for generation of torque without waste.
[0015]
Furthermore, since the permanent magnet is disposed so as to abut on the outer peripheral surface side of the extending portion of the pole core extending in the circumferential direction, the contact area between the fixed iron core (that is, the pole core) and the permanent magnet is increased in diameter of the fixed yoke. It can be expanded without much. As a result, the effect of hybridizing the DC machine can be improved without increasing the size and cost. In addition, since the magnetism of the electromagnet and the magnetism of the permanent magnet are generated with the same polarity in the extended portion, the magnetic flux becomes strong, and the magnetic flux of the permanent magnet tends to flow not to the yoke side but to the pole core.
[0016]
According to the invention described in claim 3, in addition to the operation of the invention described in claim 2, both the magnetic parts of the permanent magnet have an armature in the direction connecting the N pole and the S pole (that is, the magnetic direction). Therefore, the magnetization direction of both magnetic parts of the permanent magnet can be linearly magnetized in the armature radial direction. As a result, the permanent magnet can be easily magnetized, and the cost of the DC machine can be further reduced.
[0017]
According to the invention described in claim 4, in addition to the operation of the invention described in claim 2 or 3, the magnetism of both magnetic parts is conducted by the magnetic transmission plate material, and the exciting current of the rotating coil and the fixed coil is “0”. ", The permanent magnet field lines create a closed circuit that passes only through the stator. As a result, if the leakage magnetic flux is ignored, the cogging torque becomes “0”, and it is difficult for cogging to occur when the DC machine starts driving.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a hybrid magnet type DC motor embodying the present invention will be described with reference to FIGS.
[0019]
FIG. 1 shows a side cross section of a DC motor. A motor housing 2 of a DC motor 1 as a hybrid magnet type DC machine includes a cylindrical fixed yoke 3 and two end frames 4 and 5 fixed to both ends of the fixed yoke 3. Bearings 6 and 7 are fixed to the center portions of the end frames 4 and 5. A rotor 10 is accommodated in a space formed by the fixed yoke 3 and the end frames 4 and 5. The rotating shaft 11 of the rotor 10 is rotatably supported by both bearings 6 and 7 in a state in which a tip portion thereof protrudes from the through hole 4 a of the end frame 4.
[0020]
The DC motor 1 is a brush type DC motor, and the rotor 10 has an armature 20 and a commutator 21 that are integrally fixed on a rotating shaft 11. The commutator 21 is disposed so as to be located inside the end frame 5. Two brush holders 23 are supported on a substantially annular base plate 22 arranged so as to substantially divide between the fixed yoke 3 and the end frame 5 inside. The two brushes 24 held by each brush holder 23 are in contact with the outer peripheral surface of the commutator 21 from both sides sandwiching the commutator 21. A direct current is supplied to the brush 24 via a wiring and a connector (both not shown). The commutator 21, the brush holder 23, and the brush 24 constitute a rectifier.
[0021]
A substantially annular stator (stator) 30 is fixed to the inner peripheral surface of the fixed yoke 3. The stator 30 is arranged to face the outer peripheral surface of the armature 20 with a predetermined gap. The stator 30 of the present embodiment is configured as a hybrid magnet having two electromagnets 31 and 32 and two permanent magnets 33 and 34. The electromagnets 31 and 32 have fixed iron cores 35 and 36 and coils (hereinafter referred to as fixed coils) 37 and 38 wound around the iron core portions.
[0022]
Hereinafter, the structures of the armature 20 and the stator 30 will be described in detail.
FIG. 3 shows a front section of the DC motor 1. As shown in FIG. 1, the armature 20 includes a rotating iron core 25 fixed to the rotating shaft 11 in an externally fitted state, and a coil (hereinafter referred to as a rotating coil) 26 wound around the rotating iron core 25. The rotating iron core 25 is formed with a plurality of teeth (10 teeth in this embodiment) as teeth 25a extending radially from the central portion at equal angular intervals.
[0023]
A space formed between adjacent teeth 25a constitutes a slot 25b. The coil 26 is housed in the slot 25b while being wound around the shaft portion of the tooth 25a. A direct current is applied to the coil 26 wound around the tooth 25 a through the brush 24 that abuts the commutator 21.
[0024]
On the other hand, as shown in FIG. 3, the stator 30 is assembled in a state in which two electromagnets 31 are opposed to each other with the armature 20 interposed therebetween when viewed from the axial direction of the DC motor 1. The fixed iron cores 35 and 36 of each electromagnet 31 include pole cores 39 and 40 made of a plate material having a substantially semicircular cross section. The pole cores 39 and 40 are arranged to face the teeth 25a of the armature 20 with a predetermined gap. The fixed iron cores 35 and 36 are provided with protrusions 35a and 36a. The fixed coils 37 and 38 are fixed so that the inner space (coil axial direction) faces the armature 20 (that is, the axial direction of the fixed coils 37 and 38 is substantially the radial direction of the armature 20). The protrusions 35a and 36a of the iron cores 35 and 36 are wound around. The two fixed coils 37 and 38 are opposed to each other so as to form a substantially semicircular arc when viewed from the motor axis direction.
[0025]
The fixed coils 37 and 38 are supplied with a direct current through wiring and connectors (both not shown). When the driving switch is turned on to drive the DC motor 1, DC is supplied to the rotating coil 26 of the armature 20 and the fixed coils 37 and 38 of the electromagnets 31 and 32. The winding directions of the fixed coils 37 and 38 are set so as to be reversely wound when viewed from the motor outer peripheral surface side. Therefore, when the fixed coils 37 and 38 are excited, in FIG. 3, the pole core 39 of the electromagnet 31 positioned on the upper side is magnetized to the N pole, and the pole core 40 of the electromagnet 32 positioned on the lower side is magnetized to the S pole. It is supposed to be.
[0026]
The pole cores 39 and 40 are formed in an arc shape and have extended portions 39b, 39c, 40b, and 40c protruding from both ends of the electromagnets 31 and 32. The both end extending portions 39b, 39c of the pole core 39 and the both end extending portions 40b, 40c of the pole core 40 are opposed to each other with a predetermined distance therebetween.
[0027]
The permanent magnet 33 includes two magnetic portions 33a and 33b formed in a fan shape in cross section. Both magnetic parts 33a and 33b are arranged so that the magnetic directions are opposite to each other. In the present embodiment, the magnetic part 33a has an N pole on the inner peripheral surface side and an S pole on the outer peripheral surface side. The magnetic part 33b has an S pole on the inner peripheral surface side and an N pole on the outer peripheral surface side. A resin piece T as a magnetic insulator is interposed between the magnetic parts 33a and 33b and is magnetically separated by the resin piece T.
[0028]
The permanent magnet 33 is in contact with the outer peripheral surface side of the one end extending portion 39b of the pole core 39 in which the inner peripheral surface side (N pole) of one of the magnetic portions 33a is magnetized to the N pole. The inner peripheral surface side (S pole) of the portion 33b is disposed so as to abut on the outer peripheral surface side of the one end extending portion 40b of the pole core 40 magnetized to the S pole. Further, a core plate 41 as a magnetic transmission plate material straddling the magnetic parts 33a and 33b is in contact with the outer peripheral surface side of the permanent magnet 33. That is, the permanent magnet 33 is sandwiched between the pole cores 39 and 40 and the core plate 41, and the magnetism of both the magnetic portions 33 a and 33 b is conducted by the core plate 41. Thereby, the permanent magnet 33 is formed so that the magnetism is along the radial direction of the armature 20 (motor radial direction).
[0029]
Similarly, the permanent magnet 34 includes two magnetic portions 34a and 34b formed in a fan shape in cross section. Both magnetic parts 34a and 34b are arranged so that the magnetic directions are opposite to each other. In the present embodiment, the magnetic part 34a has an N pole on the inner peripheral surface side and an S pole on the outer peripheral surface side. Further, the magnetic part 34b has an S pole on the inner peripheral surface side and an N pole on the outer peripheral surface side. The magnetic portions 34a and 34b are magnetically separated by a resin piece T as a magnetic insulator.
[0030]
The permanent magnet 34 is in contact with the outer peripheral surface side of the other end extending portion 39c of the pole core 39 whose inner peripheral surface side (N pole) is magnetized to the N pole. The inner peripheral surface side (S pole) of the magnetic part 34b is disposed so as to contact the outer peripheral surface side of the other end extending part 40c of the pole core 40 that is magnetized to the S pole. Further, a core plate 42 as a magnetic transmission plate member straddling both the magnetic portions 34 a and 34 b is in contact with the outer peripheral surface side of the permanent magnet 34. That is, the permanent magnet 34 is sandwiched between the pole cores 39 and 40 and the core plate 42, and the magnetism of both the magnetic portions 34 a and 34 b is conducted by the core plate 41. Thereby, the permanent magnet 34 is formed so that the magnetism is along the radial direction of the armature 20 (motor radial direction).
[0031]
Between the outer peripheral surface side of the core plates 41 and 42 and the inner peripheral surface side of the fixed yoke 3, insulating materials 43 and 44 made of a resin plate material are interposed, respectively. By interposing the insulating materials 43 and 44, the permanent magnets 33 and 34 and the fixed yoke 3 are magnetically separated from each other, and magnetic insulation between them is ensured. By securing such magnetic insulation, the magnetic fluxes of the permanent magnets 33 and 34 are set so as to always pass through the pole cores 39 and 40 facing the teeth 25a.
[0032]
On the other hand, the rotating coil 26 on the armature 20 side has the rotating iron core 25 such that each tooth 25a on the left half in FIG. 3 is magnetized to the N pole and each tooth 25a on the right half is magnetized to the S pole. The winding direction is set. When the DC motor 1 is driven, the rotor 10 rotates counterclockwise in FIG.
[0033]
Next, the operation of the hybrid magnet type DC motor 1 will be described with reference to FIG. 2A shows a state in which power is not supplied to the DC motor 1, and FIG. 2B shows a state in which power is supplied to the fixed coils 37 and 38 of the DC motor 1. FIG.
[0034]
When no power is supplied to the DC motor 1, no DC current is passed through the rotating coil 26 and the stationary coils 37 and 38. As shown in FIG. 2A, when the exciting currents of the coils 26, 37, and 38 are "0", the magnetic lines A of the permanent magnets 33 and 34 are closed only through the stator 30 as shown by the solid lines. Make a circuit. Therefore, if the leakage magnetic flux is ignored, the cogging torque becomes “0”. As a result, it is difficult for cogging to occur when the DC motor 1 starts driving.
[0035]
Further, when power is supplied to the fixed coils 37 and 38 of the DC motor 1, a DC current is passed through the fixed coils 37 and 38. The direction of the current flowing through the rotating coil 26 on the armature 20 side is switched in synchronization with the rotation of the rotor 10. As a result, in the armature 20 in FIG. 2B, each tooth 25a located in the left half is magnetized to the N pole, and each tooth 25a located in the right half is magnetized to the S pole. Further, in the stator 30 shown in FIG. 2B, the upper pole core 39 is magnetized to the N pole and the lower pole core 40 is magnetized to the S pole by the direct current flowing through the fixed coils 37 and 38 on the stator 30 side. .
[0036]
Each tooth 25 a magnetized to the N pole on the left half of the rotor 10 receives a repulsive force from the pole core 39 of the N pole located on the upper half of the stator 30, and also on the lower half of the stator 30. A suction force is received from the pole core 40 of the south pole located. Similarly, each tooth 25 a magnetized to the S pole on the right half of the rotor 10 receives a repulsive force from the pole core 40 of the S pole located on the lower half of the stator 30 and also has an upper half of the stator 30. Attracting force is received from the pole core 39 of the N pole located in the center. For this reason, the rotational driving force in the counterclockwise direction in FIG. 2 acts on the rotor 10, and the DC motor 1 is rotationally driven.
[0037]
At this time, as shown in FIG. 2B, the magnetic field lines B formed by the fixed coils 37 and 38 form a closed circuit as shown by a solid line. At this time, the magnetic lines A of the permanent magnets 33 and 34 are drawn from the pole cores 39 and 40 to the rotor 10 side via the teeth 25a by the drawing action of the magnetic lines generated by the fixed coils 37 and 38, and as shown by the broken lines. It becomes the same direction as the magnetic force line B of 37,38. Therefore, the magnetic field lines passing between the stator 30 and the armature 20 are amplified by an amplifying action in which the magnetic field lines B of the fixed coils 37 and 38 and the magnetic field lines A of the permanent magnets 33 and 34 are strengthened. As a result, the DC motor 1 rotates with a large driving torque.
[0038]
As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) In the present embodiment, the permanent magnets 33 and 34 are disposed in contact with the fixed iron cores 35 and 36 so that the magnetic flux thereof is in the same direction as the magnetic flux of the electromagnets 31 and 32. It is possible to obtain a powerful magnetic flux of the following magnetic flux + permanent magnet magnetic flux.
[0039]
(2) In the present embodiment, the magnetic parts 33a, 33b, 34a, 34b of the permanent magnets 33, 34 have N pole faces N of the extension parts 39b, 39c, 40b, 40c of the pole cores 39, 40. The S pole surface is in contact with the outer peripheral surface side of the S pole side extending portions 40b, 40c on the outer peripheral surface side of the pole side extending portions 39b, 39c. Accordingly, in the extension portions 39b, 39c, 40b, and 40c, the magnetism of the electromagnets 31 and 32 and the magnetism of the magnetic portions 33a, 33b, 34a, and 34b of the permanent magnets 33 and 34 are generated with the same polarity, so the magnetic flux becomes strong. In addition, the magnetic flux of the permanent magnets 33 and 34 tends to flow not to the fixed yoke 3 side but to the pole cores 39 and 40.
[0040]
Further, with this configuration, the contact area between the fixed iron cores 35 and 36 (that is, the pole cores 39 and 40) and the permanent magnets 33 and 34 increases the length of the extended portions 39b, 39c, 40b, and 40c on the circumference. Can be enlarged. As a result, the contact area between the fixed iron cores 35 and 36 (that is, the pole cores 39 and 40) and the permanent magnets 33 and 34 can be increased without increasing the diameter of the fixed yoke 3. As a result, the effect of the hybrid can be improved without increasing the size and cost of the DC motor 1.
[0041]
(3) In this embodiment, since the inner space (coil axis direction) of the fixed coils 37 and 38 faces the armature 20, the magnets 31 and 32 are fixed so that the magnetism direction faces the armature 20 side. It is not necessary to take a shape such as bending the iron cores 35 and 36. For this reason, the magnetic flux emitted from the fixed iron cores 35 and 36 is used without waste for the generation of torque.
[0042]
(4) In the present embodiment, the permanent magnet 33 is arranged such that both magnetic portions 33a and 33b are sandwiched between the pole cores 39 and 40 and the core plate 41 with the resin piece T interposed therebetween. Further, the permanent magnet 34 is arranged so that both magnetic parts 34 a and 34 b are sandwiched between the pole cores 39 and 40 and the core plate 42 with the resin piece T interposed therebetween. Therefore, the permanent magnets 33 and 34 can be arranged more stably without deviation.
[0043]
(5) In the present embodiment, the magnetic portions 33a, 33b, 34a, 34b of the permanent magnets 33, 34 are such that the direction connecting the N and S poles (that is, the direction of magnetism) is along the motor radial direction. Since they are arranged, the magnetization directions of the magnetic portions 33a, 33b, 34a, 34b of the permanent magnets 33, 34 can be performed by linear magnetization in the motor radial direction. As a result, since the permanent magnets 33 and 34 can be easily magnetized, the cost of the DC motor 1 can be reduced.
[0044]
In addition, embodiment is not limited above, It can implement also in the following aspects.
○ The hybrid magnet type DC machine is not limited to the inner rotor type. An outer rotor type can also be used.
[0045]
○ The shape and number of teeth can be changed as appropriate.
○ The number of electromagnets on the stator side is not limited to two. In other words, the magnetic poles on the stator side (pole core) need only be able to alternately arrange N poles and S poles in the circumferential direction. For example, it is possible to adopt a structure in which four electromagnets are arranged in the circumferential direction on the stator side. Of course, a plurality of electromagnets can be used.
[0046]
The permanent magnet 33 is arranged such that both magnetic parts 33a and 33b sandwich the resin piece T and the permanent magnet 34 is arranged such that both magnetic parts 34a and 34b sandwich the resin piece T. Alternatively, a gap may be provided between the magnetic parts 33 a and 33 b of the permanent magnet 33 and a gap may be provided between the magnetic parts 34 a and 34 b of the permanent magnet 34.
[0047]
The technical idea grasped from the embodiment and other examples (including each drawing) will be described below.
(1) In any one of the technical ideas of claims 1 to 4, the fixed iron core (35, 36) has a circular arc surface facing the pole teeth (25a) of the armature (20) and serves as a magnetic pole. A pole core (39, 40) is provided.
[0048]
(2) In the technical idea of the above (1), the pole core (39, 40) has a length sufficient to face the plurality of pole teeth (25a) at a time in the circumferential direction.
(3) In any one of the technical ideas of claims 1 to 4 and (1) and (2), the fixed iron core (35, 36) protrudes from the rear surface on the outer peripheral surface side of the pole core (39, 40). The portions (35a, 36a) are provided, and the fixed coils (37, 38) are wound around the protrusions (35a, 36a).
[0049]
(4) In any one of the technical ideas of claims 1 to 4 and (1) to (3), the number of the electromagnets (31, 32) is two.
[0050]
【The invention's effect】
As described in detail above, according to the first to fourth aspects of the invention, the effect of hybridizing the DC machine can be improved without increasing the size and cost.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a hybrid magnet type DC machine of an embodiment.
FIG. 2 is a cross-sectional view for explaining the operation of the hybrid magnet type DC machine of the present embodiment.
FIG. 3 is a front sectional view of the DC machine of the present embodiment.
FIG. 4 is a front sectional view of a conventional hybrid magnet type DC machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... DC motor as a hybrid magnet type DC machine, 3 ... Fixed yoke, 20 ... Armature, 25 ... Rotating iron core, 25a ... Teeth as pole teeth, 26 ... Rotating coil, 30 ... Stator (stator), 31, 32 ... Electromagnets constituting the stator, 33, 34 ... Permanent magnets, 33a, 33b ... Both magnetic parts constituting the permanent magnet 33, 34a, 34b ... Both magnetic parts constituting the permanent magnet 34, 35, 36 ... Fixed iron core 35a, 36a ... projecting portions constituting a fixed iron core, 37, 38 ... fixed coil, 39, 40 ... pole core, 39b, 39c, 40b, 40c ... pole core extension, 41, 42 ... core as a magnetic transmission plate material plate.

Claims (4)

An armature (20) in which a rotating coil (26) is wound around a rotating iron core (25) having pole teeth (25a) on the peripheral surface and a magnetic field that always generates a rotational force is generated by a rectifier (21, 24);
Fixed coils (37, 38) are wound around fixed iron cores (35, 36) having pole cores (39, 40) close to and facing the rotating iron core (25) so that the inner space faces the armature (20). The N pole is applied to the N pole fixed iron core (35) provided between the plurality of electromagnets (31, 32) and the plurality of electromagnets (31, 32) that alternately generate magnetic fields of different polarities in the circumferential direction. A hybrid magnet (30) comprising a plurality of permanent magnets (33, 34) in contact with the S pole fixed iron core (36) in contact with the S pole;
A magnetically permeable fixed yoke (3) arranged magnetically spaced from the permanent magnets (33, 34) and in contact with the protrusions (35a, 36a) of the fixed iron core (35, 36);
The pole core (39, 40) is formed in a substantially semicircular cross-section, and the permanent magnet ( 33, 34) a hybrid magnet type DC machine characterized in that the inner peripheral surface side is brought into contact. In the hybrid magnet type DC machine according to claim 1,
The permanent magnet (33, 34) includes both magnetic parts (33a, 33b, 34a, 34b), and the magnetic parts (33a, 33b, 34a, 34b) are arranged so that their magnetic directions are opposite to each other. In addition, a hybrid magnet type DC machine characterized by being magnetically separated by a magnetic insulator. In the hybrid magnet type DC machine according to claim 2,
The magnetic parts (33a, 33b, 34a, 34b) of the permanent magnet (33, 34) are arranged so that the direction connecting the north and south poles is along the radial direction of the armature (20). A hybrid magnet type DC machine characterized by In the hybrid magnet type DC machine according to claim 2 or 3,
The magnetic portions (33a, 33b, 34a, 34b) of the permanent magnet (33, 34) are magnetically permeable plate members (41, 42) straddling the magnetic portions (33a, 33b, 34a, 34b) on the outer peripheral surface side. ) And the magnetically permeable plate material (41, 42) and the pole core (39, 40).

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